On Sunday, the new couple (and former That '70s Show costars) headed out on a guided "Superhero" tour of NYC, a fellow tour attendee tells Us Weekly.

"The tour guide told us that Ashton Kutcher and Mila Kunis took the tour earlier that day and he had left them at Overlook Bar which is the last stop of the tour," the source explains. "The Overlook Bar is known for their drawings on the wall done by famous comic artists."

Kunis, 29, and Kutcher, 34 — who sported matching Chicago Bears t-shirts for their outing — decided to stick around to watch the Bears' football game.

"Mila had her arms around Ashton's shoulders," the witness, who spotted Kunis and Kutcher after his own tour ended, shares. "They looked like a cute couple."

Ashton Kutcher and Mila Kunis at Spasso Restaurant in New York City on September 22, 2012.Dario Alequin/INFphoto.com

On Friday, a source says they enjoyed a "romantic" dinner at The Lion, and on Saturday, dined out together again at Italian restaurant Spasso, located in NYC's West Village neighborhood. After finishing their meal there, the Black Swan star and the Two and a Half Men actor were spotted packing on the PDA outside the restaurant.